Seems i have exactly the same problem ,i turned it off to clean the fans ,and when i tried to turn on the PC again ,it powered up,fans spin etc etc ,but nothing on screen ,ive tried changing gfx card,ram,cpu all to no effect ,sounds like its a dead mobo then 
my board was purchased in August last year ,would they still let me RMA it ? or am i just better buying a new board?
thanks
my board was purchased in August last year ,would they still let me RMA it ? or am i just better buying a new board?
thanks